#define _CRT_SECURE_NO_WARNINGS 1

class Solution {
public:
    int uniquePathsWithObstacles(vector<vector<int>>& obstacleGrid) {
        int m = obstacleGrid.size(), n = obstacleGrid[0].size();
        int dp[101][101] = { {0} };
        for (int i = 1; i <= m; i++)
            for (int j = 1; j <= n; j++)
            {
                if (obstacleGrid[i - 1][j - 1] == 1) dp[i][j] = 0;
                else if (i == 1 && j == 1) dp[i][j] = 1;
                else dp[i][j] = dp[i - 1][j] + dp[i][j - 1];
            }

        return dp[m][n];
    }
};